Process of making lead-sulfate pigment.



n. E. KREHER.. PROCESS 0F MAKING LEAD SULFATE PVGWIENT.

APPLICATION? FILED APR. 23, |917- ]Pmbelmmd Dm 4,1911..

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ROBERT E. RREHER, OEVCOLLINSVILLE, ILLINOIS, ASSIGBTOR TO Sll. l'JOlU'lIS SMELTHWO dt LOUIS, MISSOURI, d CORPORATJION Oli MISSOURI PROCESS OIF MKING LEAD-S'UJLFTE PIGMENT.

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.application filed April 23,

of which the followlng is a specification.

'lhis invention relates to the sublimation process of manufacturing pigment comosed of lead sulfate and lead oxid from ead bearing materials, such as the oxids, suliid and carbonate of lead, described in the patentsv to Bartlett, No. 515,039 and No. 515,040, dated February 20, 1894i. 4

ln the process as heretofore practised," the fuel, Hun and lead bearing materials are charged into a low cupola blast furnace and heated white hot, whereupon finely divided galena ore is scattered over the furnacel charge and volatilized by theV heat. 'lhe furnace gases are passed through a of cooling towers and ducts, where particles of runconsumed fuel and foreign matter settle out, and the lead vapors and are separated from the permanent gases y screening. ln this process about half of charge is smelted and tapped the lead in the ed from the furnace into pigs, by this much ldiminishing the capacity of the furnace to roduce pigment; because heretofore it has een necessary to melt the pigs and oridize them into litharge before they could be charged back into the pigment furnace.

'lhe objects of the invention are to increase the output of pigment produced in each furnace and to improve the quality of the pigment, without using any more fuel than heretofore.

The invention consists in adding to the rnace charge,

as a substitute for litharge and other lead bearing materials, a considerable amount of metallic lead in the form of irregular Hakes or little balls of thin crinkled metal resembling pop corn in size and ap earance.

Suita le apparatus for carrying out the invention'is illustrated in the accompanying drawings, the operation of which is described below: and what is claimed as the invention appears from the appended claims.

ln the drawings,

Figure 1 is a side elevation of the furnaces and cooling apparatus for producing specification of Letters Patent.

system are condensed l Patented Dec. l, lOl l.

ier?. serial no. maree. v`

pigment, one ofthe furnaces being shown in sectlon in order and the1r arrangement in the furnace; and lFlg. 2 is a vertical cro -section through- .apparatus for making Haked lead suitable to disclose the materials f for use 1n the process. The pigment producing apparatus comprises cupola blast furnaces 11, which are arranged side by side and discharge their gaseous products through a water-jacketed due 12 into a large receiving tower 13. Fromthe `receiving tower the hot gases pass through a series of cooling and settling towers 1d and pipes 15, wherein particles of unburned fuel and other undesirable solid matter settle out, and the lead fumes are condensed in the form of white powder. 'lhe gaseous products and ne metallic particles are drawn out by a fan 16 and forced into a system of dust collectors (not shown), from whence the carbonio acid gas and sulfur dioXid escape into the air leaving behind the condensed metallic particles, which resemble fine white Hour in appearance.

'.lhe Haked lead, lead lbearing materials, coke and lime stone or other dun in the furnacey charge, are shoveled,into the furnaces in layers through the charging openings 17, and the sla and molten lead produced are v,tapped o at the bottom of the furnace through suitable ta holes 18.- d blast of air is constantly lown into the furnace through the twyers 19 for AInaintwo similar low litiV taining a rate of combustion suitable for i furnace heat. found to be a. dues immedi- Galena ore (lead form is sprinkled kettle' 21, from which 1t is permitted to dow into a suitable receptacle 22 from whence1 it falls continuously 1n large drops or small streams. A stream of water 23 from a suitable tank 24L is directed against the falling lead and breaks up the lead into daky masses, which are carried with the water into a tank 25. lnI the bottom of the tank 5 there is a conveyer 20 for removing the lead Hakes to a waiting car 27' as fast as they rot .ment which comprises heating lead bearing materials and metallic lead in the form of Hakes together with Hux and fuel in a blast furnace, collecting and condensing the vapors produced, and tapping 0H the pig lead for re-chargmg into the furnace.

3. The process of making White lead pigment Which comprises heating lead bearing materials and metallic lead in the form of Hakes together with Hux and fuel in a blast furnace, collecting and condensing the vapors produced and tapping off the pig lead,

melting the pig lead and dropping it into a stream of water to Hake it for re-charging into the furnace.

Signed at Collinsville, Illinois, this 19th day of April, 1917.

ROBERT E. KREHER. 

